OK here are the HARD numbers, but first
let me give some detail on what equipment I used and how the tests were
conducted. The equipment used was
an Equotip 2 portable hardness tester, manufactured by Proceq Sa, Switzerland.
The following is an explanation snagged
from there web site.
“The EQUOTIP 2 metal hardness
tester is a light weight, yet powerful portable hardness tester for all
metallic materials. It measures the Leeb value (L) for materials, which
is a ratio of the impact velocity to the rebound velocity. This L value
is then converted to standard hardness scales such as Rockwell, Brinell, Shore,
and Vickers using conversion tables stored in the display unit and generated
from the original Leeb block.”
I had mentioned in a previous post that the
numbers that I generated when testing the stock seal were jumping around. Well like the old saying says, “when
all else fails read the instructions.”
The seals are not thick enough to be tested without providing a good
support, in fact they are at the minimum thickness for the impact device that
is used. So the seals were coupled
to a heavy support base for the test.
The seals were tested in three locations
on each side, the straight side end, center and the corner seal end. Each set of figures represents 3
impacts, the first figure is the LOWEST “L” value in the series, the second is
the HIGHEST “L” value, the third is the RANGE the forth is the MEAN “L”, the
fifth is the HARDNESS. In the
first series, “L” value is converted to Brinell hardness, in the second series
“L” is converted to Rockwell.
|
|
Min
|
Max
|
Range
|
Mean
|
Hardness Brinell
|
|
Rusty Duffy
|
|
|
|
|
|
|
Side 1
|
574
|
581
|
7
|
577
|
298
|
|
|
574
|
590
|
16
|
580
|
302
|
|
|
578
|
597
|
19
|
585
|
307
|
|
Average
|
|
|
|
|
302.33333
|
|
|
|
|
|
|
|
|
Side2
|
560
|
573
|
13
|
566
|
286
|
|
|
569
|
584
|
15
|
578
|
300
|
|
|
586
|
598
|
12
|
591
|
314
|
|
Average
|
|
|
|
|
300
|
|
|
|
|
|
|
|
|
|
Min
|
Max
|
Range
|
Mean
|
Hardness Rockwell
|
|
Side 1
|
571
|
593
|
22
|
580
|
31.4
|
|
|
578
|
582
|
4
|
580
|
31.4
|
|
|
561
|
563
|
2
|
562
|
28.8
|
|
Average
|
|
|
|
|
30.533333
|
|
|
|
|
|
|
|
|
Side 2
|
576
|
578
|
2
|
577
|
31
|
|
|
578
|
583
|
5
|
580
|
31.4
|
|
|
583
|
587
|
4
|
585
|
32.1
|
|
Average
|
|
|
|
|
31.5
|
|
|
|
|
|
|
|
|
Rusty's Broken
Seal. Only tested in 2 places
|
Min
|
Max
|
Range
|
Mean
|
Hardness Brinell
|
|
Side 1
|
571
|
600
|
29
|
584
|
306
|
|
|
565
|
588
|
23
|
576
|
297
|
|
Average
|
|
|
|
|
301.5
|
|
|
|
|
|
|
|
|
Side 2
|
588
|
592
|
4
|
589
|
312
|
|
|
580
|
600
|
20
|
587
|
310
|
|
Average
|
|
|
|
|
311
|
|
|
|
|
|
|
|
|
|
Min
|
Max
|
Range
|
Mean
|
Hardness Rockwell
|
|
Side 1
|
558
|
580
|
22
|
570
|
30.1
|
|
|
576
|
588
|
12
|
584
|
32.2
|
|
Average
|
|
|
|
|
31.15
|
|
|
|
|
|
|
|
|
Side 2
|
576
|
588
|
12
|
583
|
32.1
|
|
|
587
|
592
|
5
|
589
|
33
|
|
Average
|
|
|
|
|
32.55
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Ed Anderson
|
Min
|
Max
|
Range
|
Mean
|
Hardness Brinell
|
|
Side 1
|
525
|
554
|
29
|
541
|
260
|
|
|
524
|
549
|
25
|
536
|
255
|
|
|
548
|
562
|
14
|
557
|
277
|
|
Average
|
|
|
|
|
264
|
|
|
|
|
|
|
|
|
Side 2
|
557
|
584
|
27
|
571
|
292
|
|
|
566
|
577
|
11
|
573
|
294
|
|
|
574
|
577
|
3
|
575
|
298
|
|
Average
|
|
|
|
|
294.66667
|
|
|
|
|
|
|
|
|
|
Min
|
Max
|
Range
|
Mean
|
Hardness Rockwell
|
|
Side 1
|
534
|
562
|
28
|
550
|
26.9
|
|
|
516
|
538
|
22
|
531
|
23.1
|
|
|
530
|
558
|
20
|
549
|
26.8
|
|
Average
|
|
|
|
|
25.6
|
|
|
|
|
|
|
|
|
Side 2
|
562
|
588
|
26
|
577
|
31.2
|
|
|
555
|
68
|
13
|
564
|
29.2
|
|
|
554
|
578
|
24
|
567
|
29.6
|
|
Average
|
|
|
|
|
30
|
I can only speculate on the difference
between hardness values on Ed’s seal.
This seal had a noticeable ridge worn in both sides from the apparent
rocking motion in the rotor apex slot.
I am not a Professional Engineer, But I did
sleep in my own bed last night. (I think!)
Bob Perkinson
Hendersonville,
TN.
RV9A
If Nothing
Changes
Nothing
Changes!